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Forum: Pentax K-3 & K-3 II 03-14-2019, 07:53 AM  
A Lenses
Posted By clackers
Replies: 23
Views: 3,082
Very mischievous of you, Paul! :)
Forum: Pentax K-3 & K-3 II 03-14-2019, 03:11 AM  
A Lenses
Posted By Paul the Sunman
Replies: 23
Views: 3,082
The most recent Pentax lens release (HD FA 35mm f/2) has an aperture ring. :lol:
Forum: Pentax K-3 & K-3 II 03-13-2019, 04:14 PM  
A Lenses
Posted By MarkJerling
Replies: 23
Views: 3,082
I'd like to address only this sentence of yours.



The A setting is available on many lenses, not only Sigma. It simply means that you can use your camera to set the lens aperture, you don't have to set it on the lens.



The camera is still capable of using all the varied f-stop settings. Nothing is prohibited, provided you ensure you use your camera in one of the modes where changing the F-stop value is possible.
Forum: Pentax K-3 & K-3 II 03-13-2019, 03:56 PM  
A Lenses
Posted By pschlute
Replies: 23
Views: 3,082
If you have a lens with aperture ring and "A" setting then use the "A" setting. Taking the ring out of "A" severely restricts what exposure modes can be used with a modern DSLR. Basically you are stuck with Manual and need to use stop down metering. In any other mode such as Av , the camera will only use wide open aperture irrespective what you set on the lens.
Forum: Pentax K-3 & K-3 II 03-13-2019, 03:13 PM  
A Lenses
Posted By Adam
Replies: 23
Views: 3,082
The aperture ring is obsolete (on DSLRs). Unless you are reverse mounting the lens or something like that, then simply leave the aperture ring in the "A" setting and then set the aperture using the e-dial (or automatically).
Forum: Pentax K-3 & K-3 II 03-13-2019, 03:08 PM  
A Lenses
Posted By BigMackCam
Replies: 23
Views: 3,082
Hello and welcome :)

Any K-mount lens, whether Pentax, Sigma, Tamron or otherwise, with a dedicated aperture ring and "A" setting on it allows you to set the aperture from the camera's control wheel by setting the ring to the "A" position. Then, from within any of the P, Sv, Tv, Av, TAv, M and B modes, you select the aperture of the lens using the control wheel on the camera. For lenses without a dedicated aperture ring (e.g. Pentax DA lenses), they operate as those with a ring set to the "A" position.

I don't know what Pentax and Sigma lenses you've been using. Generally, I would say most modern Pentax lenses are great. Older models vary, but are mostly OK-to-excellent. Sigma lenses are, in my experience, much more variable in performance depending on whether they're primes, zooms, and the era in which they were developed and released. Generally, I prefer Pentax lenses. But there are exceptions, such as the DA*16-50, where the Sigma equivalent - in this case, the 17-50 f/2.8 HSM - is arguably better optically.

The latest Sigma lenses can be very good indeed, but those that are compatible with Pentax K-mount sometimes have inconsistent or unreliable auto-focusing, as Sigma reverse-engineered Pentax AF operation when designing its lenses, rather than paying for a licence to use the official specification :o
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